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A method and device for recycling waste lithium-ion batteries using oxalic acid as an extraction solution

A lithium-ion battery, recycling technology, applied in battery recycling, waste collector recycling, recycling technology, etc., can solve secondary pollution and other problems

Active Publication Date: 2016-04-13
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method mainly uses strong acid, which is easy to cause secondary pollution; at the same time, the extracted products such as CoCl 2 、CoSO 4 And so often through a more complex process to get industrial raw materials (such as Co 2 o 3 ), and cobalt oxalate is very easy to be calcined to obtain Co 2 o 3

Method used

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  • A method and device for recycling waste lithium-ion batteries using oxalic acid as an extraction solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Such as figure 1 Shown, a kind of waste lithium-ion battery recycling treatment method using oxalic acid as extracting solution comprises the steps:

[0024] Step 1: Discharge the waste lithium-ion battery.

[0025] Step 2: Use a shear crusher to mechanically crush the discharged waste lithium-ion batteries, and screen out materials smaller than 1.43mm (mainly lithium cobalt oxide).

[0026] Step 3: Place the beaker on the constant temperature stirrer to form the leaching device. The constant temperature stirrer is composed of a water bath with automatic temperature control and an electric stirrer with adjustable speed inserted into it. The waste lithium ion battery cathode material was crushed and screened to materials smaller than 1.43 mm, and reacted with oxalic acid with a concentration of 0.5 mol / L in a beaker for 40 minutes according to the solid-to-liquid ratio of 15 g / L. During the process, the temperature of the thermostatic stirrer was set at 75° C., and the...

Embodiment 2

[0029] Such as figure 1 Shown, a kind of waste lithium-ion battery recycling treatment method using oxalic acid as extracting solution comprises the steps:

[0030] Step 1: Discharge the waste lithium-ion battery.

[0031] Step 2: Use a shear crusher to mechanically crush the discharged waste lithium-ion batteries, and screen out materials smaller than 1.43mm (mainly lithium cobalt oxide).

[0032] Step 3: Place the beaker on top of a constant temperature stirrer to form a leaching device. The waste lithium-ion battery cathode material was crushed and screened to materials smaller than 1.43 mm, and reacted with oxalic acid at a concentration of 1 mol / L in a beaker for 90 minutes at a solid-to-liquid ratio of 25 g / L. During the process, the temperature of the thermostatic stirrer was set at 95° C., and the rotor speed was 400 rpm.

[0033] Step 4: Separation of solid and liquid, the mixture after the oxalic acid leaching reaction in step 3 is filtered and separated to obtain...

Embodiment 3

[0035] Such as figure 1 Shown, a kind of waste lithium-ion battery recycling treatment method using oxalic acid as extracting solution comprises the steps:

[0036] Step 1: Discharge the waste lithium-ion battery.

[0037] Step 2: Use a shear crusher to mechanically crush the discharged waste lithium-ion batteries, and screen out materials smaller than 1.43mm (mainly lithium cobalt oxide).

[0038] Step 3: Place the beaker on top of a constant temperature stirrer to form a leaching device. The positive electrode material of the spent lithium ion battery was crushed and sieved to materials smaller than 1.43 mm, and reacted with oxalic acid with a concentration of 0.8 mol / L in a beaker for 60 min at a solid-to-liquid ratio of 20 g / L. During the process, the temperature of the constant temperature stirrer was set at 85° C., and the rotor speed was 340 rpm.

[0039] Step 4: Separation of solid and liquid, the mixture after the oxalic acid leaching reaction in step 3 is filtered...

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Abstract

A method for recycling treatment of a waste lithium ion battery with oxalic acid as an extracting solution comprises the steps: carrying out electric discharge treatment of the waste lithium ion battery, mechanically crushing by a shear-type crusher, screening out a material having the particle size smaller than 1.43 mm, placing a beaker on a constant-temperature stirrer to form a leaching device, carrying out a reaction of the screened material and oxalic acid with the concentration of 0.5-1 mol / L according to the solid-liquid ratio of 15-25 g / L in the beaker for 40-90 min, carrying out filtering separation of a mixture obtained after the oxalic acid leaching reaction, and thus obtaining a solid precipitate containing cobalt oxalate and a leached solution containing lithium oxalate. The invention also provides a device for realizing the method. The method can effectively recycle cobalt oxalate and lithium oxalate in a positive electrode material of the waste lithium ion battery; and by adopting environment-friendly oxalic acid as the leaching solution, the recycling rate of cobalt oxalate and lithium oxalate is more than 99%.

Description

technical field [0001] The invention belongs to the technical field of recycling electronic waste, and in particular relates to a waste lithium ion battery recovery and treatment method and device using oxalic acid as an extraction liquid. Background technique [0002] Waste lithium-ion batteries are widely used in daily life due to their high energy density, large working voltage, no memory effect and long cycle life, such as cameras, mobile phones, notebook computers and portable measuring instruments. Among various consumer electronics, it is also the preferred portable high-energy power source for electric vehicles. After these lithium-ion batteries are scrapped, they usually bring certain risks to the environment and human health. At the same time, the metal cobalt (Co) contained in waste lithium-ion batteries is a high-value strategic resource, so no matter from the perspective of environmental protection or economics, resource recovery of waste lithium-ion batteries ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/54C22B7/00
CPCC22B7/007H01M10/54Y02P10/20Y02W30/84
Inventor 李金惠曾现来申冰玉刘丽丽
Owner TSINGHUA UNIV